Shi Kaiqiang, Wang Yi, Xu Anlin, Zhu Hongwei, Gu Liankai, Liu Xiaodong, Shen Jinyou, Han Weiqing, Wei Kajia
Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China.
Nanjing Tech University, School of Environmental Science and Engineering, Nanjing 211816, Jiangsu, China.
Chemosphere. 2023 Jan;311(Pt 2):137196. doi: 10.1016/j.chemosphere.2022.137196. Epub 2022 Nov 9.
Ibuprofen (IBP) is a carcinogenic non-steroidal anti-inflammatory drug (NSAID). It is of certain hazard to aquatic animals and may cause potential harm to human health. As traditional methods cannot effectively remove such a pollutant, many advanced oxidation processes (AOPs) have been developed for its degradation. The electro-Fenton process has the advantages of strong oxidative ability, a synergistic effect of various degradation processes, and a wide application range. This study developed a high-performance gas diffusion electrode (GDE) for electrochemical hydrogen peroxide (HO) production. The optimum system performance was found at the current density of 10 mA cm, pH of 7.0, and air flow rate at 0.6 L min, where the accumulation of HO could reach as high as 769.82 mg L. The computational fluid dynamics (CFD) simulation results revealed a fast mass-transfer property in this electro-Fenton system with U-tube GDEs, which resulted in a deep-level degradation (∼100%) of the pollutant (IBP) and a low-concentration degradation of 10 mg L within a 120-min reaction period. The high-performance liquid chromatography-mass spectrometry (LC-MS) studies demonstrated that the hydroxyl radicals were the primary active species in the electro-Fenton system and that the degradation intermediates of IBP were mainly 1-(4-isobutylphenyl) ethanol and 2-hydroxy-2-(4-isobutyl phenyl) propanoic acid through four probable electro-Fenton degradation pathways. This report provides a facile and efficient way to construct a high-performance electro-Fenton reactor, which could be effectively used in advanced oxidation processes (AOPs) to remove emerging contaminants in wastewater and natural water.
布洛芬（IBP）是一种致癌性非甾体抗炎药（NSAID）。它对水生动物具有一定危害，并且可能对人类健康造成潜在损害。由于传统方法无法有效去除此类污染物，因此已开发出许多高级氧化工艺（AOPs）用于其降解。电芬顿工艺具有氧化能力强、各种降解过程的协同效应以及应用范围广等优点。本研究开发了一种用于电化学产过氧化氢（HO）的高性能气体扩散电极（GDE）。在电流密度为10 mA cm、pH值为7.0以及空气流速为0.6 L min时发现了最佳系统性能，此时HO的积累量可高达769.82 mg L。计算流体动力学（CFD）模拟结果表明，该具有U型管GDE的电芬顿系统具有快速的传质特性，这导致污染物（IBP）在120分钟的反应期内实现深度降解（约100%）以及10 mg L的低浓度降解。高效液相色谱 - 质谱（LC - MS）研究表明，羟基自由基是电芬顿系统中的主要活性物种，并且通过四种可能的电芬顿降解途径，IBP的降解中间体主要为1 - （4 - 异丁基苯基）乙醇和2 - 羟基 - 2 - （4 - 异丁基苯基）丙酸。本报告提供了一种简便有效的方法来构建高性能电芬顿反应器，该反应器可有效地用于高级氧化工艺（AOPs）中以去除废水和天然水中的新兴污染物。
